Changeable picture.



No. 736,035. PATBNTED AUG. 11, 1903.

J. STEVENSON.

CHANGEABLB PICTURE.

APPLICATION TILED FEB. 24, 1903.

H0 MODEL THE Nonms PETERS cu. no-rcxumu. WASHINGTON. o. c.

to the atmosphere. I

No reacts.

NITED STATES i atented August 11,

JOHN STEVENSON, OF EDINBURGH, SCOTLAND.

CHANGEABLE PICTURE;

srn'ornrcnrroiv forming part of Letters Jatent 1\To. 756,035, dated August 11, 19cc.

Original application filed January 15, 1901, Serial No. 43,402. No. 144,306.

To aZZ whom it may cOnOern:

Be it known that I, JOHN STE NSON, a subject of the King of Great Britain and Ireland, and a resident of 4 Albert Terrace, Trinity, Edinburgh, county of Mid-Lothian, Scotland, have invented a certain new and useful Changeable Picture, (which I have divided out from Serial No. 43,402, filed January 15, 1901, and for which I have made application for Letters Patent in Great Britain,No.17,783, dated October 6, 1900,) of which the following is a specification.

My invention relates to an improved method of representation of designs or characters upon paper, cloth, or other material and the picture produced thereby; and the object of the invention is to enable a gradually-changing eitect in the designs to be obtained under the action of light or internal chemical action or chemical action resultingfrom exposure The invention consists ot' printing a representation in a permanent color then applying over said representation, so as to conceal or cover the same, a color of different hue which is non-permanent and disappears when exposed to light, and then exposing the representation to the action of light, whereby the non-permanent color disappears and leaves the representation in a permanent color.

It also consists of a changeable picture produced by practicing the said process.

In carrying the invention into effectI em ploy for making a design pigments of diiferent color, one or more of which may be permanent and the remainder n'ou-permanent. In making a design from permanent and nonpermanent colors one color is applied first to the paper or other material, and the remaining colors are superimposed upon it. On exdosing the design to the light the non-per manent colors disappear and leave the permanent color or colors to indicate the design.

In order that my invention may be clearly understood, I shall now particularly describe it with reference to the accompanying drawings, in which-- Figure 1 represents the appearance of one form of prepared print in accordance with my invention. Fig. 2 represents the same print Divided and this application filed February 24, 1903. Sari (No model.)

after it has been exposed to the action of lightfor some time; and Fig. 3 represents the fully-exposed print, showing the developed picture. Fig. 4 represents a design in which letters or characters are printed in ac= cordance with my invention. Fig. 5 represents the result of exposing the design to the action of light.

Referring now to Figs. 1- to 3, in carrying out my invention according to one modification I print in one or more colors, according to any of the well-known processes of printing a picturefor example, such as is seen in Fig. 3and over the whole picture I apply a dark non-permanent color-pigment, so as to completely obliterate the picture, the result being similar to that represented in Fig. 1. In addition to the fugitive dark pigment employed for rendering the whole picture invisible some of the colors of the diiferent. parts of the design may be overlaid with non-permanent color, which is not so fugitive as the dark obliterating color. For example, in the design shown in Fig. 3 the leaves a. may be printed in permanent green, while the rose 5 may be printed in permanent yellow covered over by some color-for example, an impermanent white--which is relatively less fugitive than the dark obliterating color. The result after partial exposure ofthe print seen in Fig. l is as illustrated in Fig. 2, where the dark obliterating color has practically completely disappeared, showing the picture with its colors partially developed, the leaves a then appearing in green color and the rose 1) with its outlines incompletely defined. Upon further exposure the picture appears, as illustrated in'Fig. 3, in its natural permanent colors,showing ayellowrose with green leaves. In applying my invention-for the purpose of producing changeable representations in printed letters or characters I first print in permanent pigment or inl; a combination of letters which"for,msan intelligible word or words-for example, such as is seen in Fig. 5. I then add to the letters by printing in nonpermanent colors any arrangement of markings which will render the words unintelligible, as illustrated in Fig. 4, where the nonpermanent parts are indicated by the double ICO lines 0. Upon exposure to light of the design shown in Fig. 4; the parts marked 0 disappear, producing the original intelligible words.

It will be obvious that according to my invention many varied effects pleasing to the eye may be produced.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The process of producing pictures consisting of printing a representation in a permanent color, then applying over said representation, so as to conceal or cover the same, a color of different hue, which is non-permanent and disappears when exposed to light, and then exposing the representation to the action of the light, whereby the non-permation, and another is non-permanent and dis l.

appears when exposed to light, is of a difierent hue from the permanent color, and is applied all over said permanent color so as to temporarily conceal or cover the same.

In witness whereof Ihave hereunto set my hand in presence of two witnesses.

JOHN STEVENSON.

Witnesses:

ALEXANDER THORBURN, JOHN SHANKS. 

